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Compare the published Medicare service mix of Guy Vin Chang, M.D. with clinicians in the same registry specialty: Geriatric Medicine (CMS).

WASHINGTON, DC · Exact areaEdit location

2024 published service data · 11 eligible profiles compared. Similarity describes billing patterns, not quality, outcomes, or suitability for your care.

Austin James Armstrong, MD

Geriatric Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes (99350)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
90%Service-mix similarityView profile →

Robert L. Jayes, M.D.

Internal Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes (99350)
  • Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and (G0180)
  • Advance care planning, first 30 minutes (99497)
62%Service-mix similarityView profile →

Tahira Irum Lodhi, M.D.

Family Practice · Geriatric Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)
  • Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)
  • Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and (G0180)
48%Service-mix similarityView profile →

Louisa Wall Whitesides, M.D.

Internal Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes (99350)
  • Prolonged home or residence evaluation and management service(s) beyond the total time for the primary service (when the primary service has been selected using time on the date of the primary service); each additional 15 minutes by the physician or qualif (G0318)
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
30%Service-mix similarityView profile →

Paul S. Rhodes, M.D.

Internal Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes (99350)
  • Advance care planning, first 30 minutes (99497)
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
28%Service-mix similarityView profile →

Raj Pratap Mathur, MD

Internal Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and (G0180)
  • Administration of influenza virus vaccine (G0008)
  • Physician or allowed practitioner re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians a (G0179)
24%Service-mix similarityView profile →

Victoria Fedorova, M.D.

Geriatric Medicine (CMS) · Washington, DC

Shared published services
3 shared services · view billing descriptions
  • Advance care planning, first 30 minutes (99497)
  • Administration of influenza virus vaccine (G0008)
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
20%Service-mix similarityView profile →

Elizabeth Lipton Cobbs, MD

Geriatric Medicine · Internal Medicine (CMS) · Washington, DC

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
16%Service-mix similarityView profile →

Mikhail Kogan, MD

Geriatric Medicine (CMS) · Washington, DC

Shared published services
2 shared services · view billing descriptions
  • Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)
  • Telephone medical discussion with physician, 11-20 minutes (99442)
12%Service-mix similarityView profile →

Laila Alamgir, MD

Geriatric Medicine · Internal Medicine (CMS) · Washington, DC

Shared published services
1 shared services · view billing descriptions
  • Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)
11%Service-mix similarityView profile →
How this comparison works

We use the same calendar year of CMS Medicare Physician & Other Practitioners data for both providers. Published non-drug service counts are combined by HCPCS code across places of service. We apply log(1 + count), normalize the vectors, and compare them using cosine similarity.

Candidates share the reference provider’s current NPPES primary taxonomy and match the location you enter. We examine up to 500 candidates in NPI order, then show up to 12 with the highest positive similarity within that set. The score is not a percentile, medical recommendation, or prediction. Suppressed services are not estimated. Medicare fee-for-service data does not describe a provider’s entire practice.

Source: CMS Medicare Physician & Other Practitioners - by Provider and Service : 2024-12-01 · Published May 21, 2026.